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PUSH-BUTTON START SYSTEM Power Source Mode does not Change to ON (ACC)

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DTC Code DTC Name
  Power Source Mode does not Change to ON (ACC)
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DESCRIPTION

When the key is in the vehicle and the power switch is pressed, the power management control ECU receives a signal and changes the power source mode.

Use this troubleshooting procedure when the power source mode does not change to on (ACC) but does change to on (IG).

Tip:

  • When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) auxiliary battery terminal, the power source mode changes to on (IG).

  • When the auxiliary battery cable is disconnected and reconnected, the power source mode returns to the mode it was in before the auxiliary battery cable was disconnected.

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WIRING DIAGRAM

Refer to DTC B2274 (Click here).

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INSPECTION PROCEDURE

Note:

  • When using the intelligent tester with the power switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the intelligent tester and vehicle begins, or 2) connect the intelligent tester to the vehicle, select the vehicle type under manual mode, and then enter the following menus:

    for Power Source Control: Body / Power Source Control / DTC.

    for Entry&Start: Body / Entry&Start / DTC.

  • Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart (Click here).

  • The push-button start system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting (Click here).

  • If the push-button start system is disabled through the customize function, enable the system before performing troubleshooting (Click here).

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • After completing repairs, confirm that the problem does not occur.

Tip:
Table 1. Related Data List and Active Test Items
Problem Symptom Data List Item Active Test Item
Power source mode does not change to on (ACC) but does change to on (IG)
  • Power Source Control

  • Power Supply Condition

  • ACC Relay Monitor

 -
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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the H3 and H4 connectors from the power management control ECU.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      H3-1 (AM22) - Body ground Always 9.5 to 16 V
      H4-7 (AM21) - Body ground Always 9.5 to 16 V

  2. Click here

    CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)


    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H3-5 (E01) - Body ground Always Below 1 Ω
      H3-6 (E1) - Body ground Always Below 1 Ω
      H4-4 (E12) - Body ground Always Below 1 Ω
      H4-5 (E02) - Body ground Always Below 1 Ω

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    INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. A003VTWE15

      Remove the instrument panel junction block assembly (Click here).

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-43 - 2B-4 20°C (68°F) 81.49 to 118.98 Ω
      2A-43 - 2B-6 20°C (68°F) 81.49 to 118.98 Ω
      2B-4 - 2B-6 Always Below 1 Ω
      Table 2. Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

  4. Click here

    CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INSTRUMENT PANEL J/B)


    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H4-1 (ACCD) - 2A-43 Always Below 1 Ω
      H4-1 (ACCD) - Body ground Always 10 kΩ or higher

  5. Click here

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND)


    1. Measure the resistance according to the value(s) the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      2B-4 - Body ground Always Below 1 Ω
      2B-6 - Body ground Always Below 1 Ω

  6. Click here

    INSPECT POWER MANAGEMENT CONTROL ECU


    1. A003XTAE11

      Install the instrument panel junction block assembly (Click here).

    2. Reconnect the H3 and H4 connectors.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      H4-1 (ACCD) - Body ground Power switch on (ACC) Output voltage at terminal AM21 or AM22 is -2.5 V or more
      Table 3. Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. Click here

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLYClick here

  10. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE POWER MANAGEMENT CONTROL ECUClick here

  13. Click here

    USE SIMULATION METHOD TO CHECKClick here